An urban balcony, a brick façade, and a limited space: this is the perfect setting for a neat, quiet, and durable HVAC installation . In this condo in Southwest Montreal , our AirGreen team replaced an old portable air conditioner with a modern wall-mounted heat pump —to provide efficient four-season heating and cooling without compromising the balcony's aesthetics or the neighbors' peace and quiet.
Why this installation stands out
In a condominium with a narrow balcony and metal railing, every centimeter counts. We designed a layout that respects air clearances, limits vibrations and facilitates maintenance, while optimizing the performance of a Midea from the Midea28 range (R-454B refrigerant, low temperature performance).
Client context and objectives
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Profile : co-owner occupant, south-east facing condo, high solar load in the afternoon.
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Needs : summer comfort without noisy machines, stable additional heating until the very cold, reduced operating costs, zero water infiltration.
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Constraints : narrow balcony, nearby railing, immediate neighbor above, co-ownership regulations requiring discreet installation and controlled noise levels.
Equipment selection: Midea (Midea28 range) 12,000 BTU
We are choosing a Midea wall-mounted heat pump from the Midea28 range in 12,000 BTU , a format perfectly suited to typical condo sizes. Key points:
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New generation R-454B refrigerant , more efficient than R-410A.
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Reliable operation in cold weather (down to approximately −30°C ), useful for reducing the use of electric baseboard heaters in winter.
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Hydrophilic treatment of the blue fins on the condenser to promote water flow and limit frost.
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Silent operation and fine modulation of the compressor to stabilize the interior temperature.
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Typical eligibility for energy efficiency programs when criteria (power, efficiency, low temperature) are met.
Expected result: 4-season comfort with significant energy savings compared to a portable air conditioner and 100% electric heating.
Site diagnosis and implementation strategy
Clearances and air circulation
The balcony has an openwork railing on the street side. We place the condenser on a self-supporting aluminum support (adjustable feet), guaranteeing:
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Sufficient frontal and lateral clearance for air intake and exhaust;
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Anti-vibration floor pads (neoprene pads) to cut off transmission to the balcony floor;
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Sufficient height to keep the fins away from dust flakes and blown snow.
Bracing and safety
A discreet brace connects the rear of the support to the guardrail in order to stiffen the assembly against the wind; an ideal solution at height while remaining non-intrusive and reversible if necessary.
Minimal refrigeration run
The inner head is located behind the brick wall. We favor an ultra-short path (approximately 1.5–2 m) to maximize yield:
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Wall-to-wall passage with clean core sloping outwards;
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Sleeve and sealant for airtightness;
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High density closed insulation on the connections to prevent condensation in summer.
Power supply and power off
An outdoor disconnect box is mounted near the line entry, with an armored conduit and cable drip to prevent water from running into the unit. The dedicated circuit breaker is sized according to the unit's nameplate.
Condensate management
In the gravity configuration, the drain from the interior head slopes outward. No condensate pump is required—a choice that reduces noise and maintenance, much sought after in condominiums.
AirGreen execution: method and quality controls
Soldering and sealing
We use deoxidized copper brazed with silver, with nitrogen protection (purging) to prevent internal oxidation. The connection tightening torques are applied by dynamometer according to the manufacturer.
Vacuum draw and charge
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Deep vacuum down to < 500 microns, stabilized, leak test.
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Opening of valves and commissioning according to the actual length of lines (short route = minimal pressure losses).
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Checking pressures , temperatures , currents and superheat/subcooling at different speeds.
Acoustics and vibrations
Anti-vibration pads on the floor and stiffening on the guardrails reduce structural transmission. Measurement at 1 m and 3 m: noise level in accordance with the condominium and neighborhood regulations.
Finish and durability
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Clean crimping of the collars, curvature radii respected;
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UV protection of insulation;
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Circuit labeling , polarity identification, and maintenance logbook given to the customer.
Everyday performance and comfort
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Cooling : Inverter modulation eliminates on/off cycles, stabilizing indoor temperature and humidity.
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Heating : maintains capacity at low temperature — practical for covering the off-season and a large part of the Montreal winter.
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Silence : priority in co-ownership; the location and anti-vibration devices make the unit barely audible from inside and from neighbors.
With equal consumption, a typical condo can save 25–40% of annual energy by replacing a portable/electric coil with a properly sized and properly installed wall-mounted heat pump (indicative order of magnitude; reality depends on habits and the envelope).
Grants and Compliance
Depending on the configuration and current programs, this HVAC installation may be eligible for energy efficiency grants if seasonal performance and extreme cold heating thresholds are met. We support the client in:
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Check eligibility (model, power, documents);
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Gather evidence of installation ;
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Submit applications on time.
Preventive maintenance: protecting your investment
To maintain performance and warranty:
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Gentle cleaning of exchangers and filters (1–2 times/year);
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Inspection of fittings , drain , insulation and disconnect box ;
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Verification of parameters (intensities, pressures) using diagnostic tools;
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Seasonal clearance around the unit; avoid storing objects in front of the discharge opening .
AirGreen offers HVAC maintenance plans tailored to condominiums in Greater Montreal (Montreal, Laval , Longueuil , North Shore , South Shore ).
Pitfalls to Avoid on a Condo Balcony
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Insufficient frontal clearance : it suffocates the condenser and increases pressure.
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Floating mount : Without stiffening, wind and inverter cycles generate resonances.
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Drilling without slope : risk of water returning into the wall.
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Refrigeration lines too tight : mechanical constraints and noise.
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Condensate pump unnecessary : more noise and maintenance than a well-designed gravity drain .
Project progress
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Technical visit and validation of the co-ownership ;
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Layout design (support, bracing, electrical );
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One-day installation : drilling, soldering, vacuum, powering up, testing;
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Submission of the file (photos, parameters, warranty sheets) and customer training on optimal use.
What the customer notices immediately
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Stable temperature , drier air;
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Reduced noise inside and on the balcony;
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Preserved space and neat aesthetics;
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Better control of electricity bills , especially in spring and fall.
Why AirGreen
Our team is adept at working with complex urban environments : narrow balconies, condominium regulations, noise pollution, and brick wall penetrations. We deliver robust, documented , grant -ready HVAC systems that are built to last.
Need a similar installation in Greater Montreal?
Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , we size and install your heat pump according to the rules of the art, with instrumented commissioning and complete support.
Technical sheet - in brief
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Type : Single-zone wall-mounted heat pump , 12,000 BTU.
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Brand / range : Midea – Midea28 (R-454B, low temperature).
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Installation : self-supporting anti-vibration support, braced to the guardrail; ultra-short refrigeration path; external disconnection ; gravity drain; watertight seal.
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Objectives : 4-season comfort, energy savings , co-ownership compliance, simplified HVAC maintenance .